linux-kernel - [PATCH 4.9 21/42] airo: Fix read overflows sending packets

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Date:   Tue,  9 Jun 2020 19:44:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hu Jiahui <kirin.say@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Kalle Valo <kvalo@...eaurora.org>
Subject: [PATCH 4.9 21/42] airo: Fix read overflows sending packets

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 11e7a91994c29da96d847f676be023da6a2c1359 upstream.

The problem is that we always copy a minimum of ETH_ZLEN (60) bytes from
skb->data even when skb->len is less than ETH_ZLEN so it leads to a read
overflow.

The fix is to pad skb->data to at least ETH_ZLEN bytes.

Cc: <stable@...r.kernel.org>
Reported-by: Hu Jiahui <kirin.say@...il.com>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Link: https://lore.kernel.org/r/20200527184830.GA1164846@mwanda
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/cisco/airo.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

--- a/drivers/net/wireless/cisco/airo.c
+++ b/drivers/net/wireless/cisco/airo.c
@@ -1928,6 +1928,10 @@ static netdev_tx_t mpi_start_xmit(struct
 		airo_print_err(dev->name, "%s: skb == NULL!",__func__);
 		return NETDEV_TX_OK;
 	}
+	if (skb_padto(skb, ETH_ZLEN)) {
+		dev->stats.tx_dropped++;
+		return NETDEV_TX_OK;
+	}
 	npacks = skb_queue_len (&ai->txq);
 
 	if (npacks >= MAXTXQ - 1) {
@@ -2130,6 +2134,10 @@ static netdev_tx_t airo_start_xmit(struc
 		airo_print_err(dev->name, "%s: skb == NULL!", __func__);
 		return NETDEV_TX_OK;
 	}
+	if (skb_padto(skb, ETH_ZLEN)) {
+		dev->stats.tx_dropped++;
+		return NETDEV_TX_OK;
+	}
 
 	/* Find a vacant FID */
 	for( i = 0; i < MAX_FIDS / 2 && (fids[i] & 0xffff0000); i++ );
@@ -2204,6 +2212,10 @@ static netdev_tx_t airo_start_xmit11(str
 		airo_print_err(dev->name, "%s: skb == NULL!", __func__);
 		return NETDEV_TX_OK;
 	}
+	if (skb_padto(skb, ETH_ZLEN)) {
+		dev->stats.tx_dropped++;
+		return NETDEV_TX_OK;
+	}
 
 	/* Find a vacant FID */
 	for( i = MAX_FIDS / 2; i < MAX_FIDS && (fids[i] & 0xffff0000); i++ );